①11.4+2(x-7.4)=14.6
②※6x-16.3-13.7=4x
÷= ×= 1.02﹣0.43= 597×8≈
126÷3= 0.25×0.8= 1÷25%= 725÷92≈
①250-250÷25×2
②18÷ ×
③5.2÷0.4÷2.5
④(34- )÷17
⑤4.3×1.75-1.75+ ×6.7
⑥ ×[(72.8-69.6)÷ ]